Mapping the intracluster gas is largely done with red light from the ionized emission lines of hot hydrogen.
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Q1: Galaxies contain less mass as dark matter
Q2: The Andromeda galaxy will eventually collide with
Q3: In the larger clusters, colliding galaxies tend
Q3: Collisions between galaxies have little effect on
Q4: The masses of most spiral galaxies, like
Q5: Because of the great masses and speeds
Q7: Both spiral and elliptical galaxies seem to
Q8: The total mass of a galaxy tends
Q9: As with stars, binary galaxy pairs are
Q11: Head- tail radio galaxies reveal their motion
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